Device for presenting and cutting the selected weft threads in stationary weft looms

ABSTRACT

Apparatus for presenting weft yarns to the inserting element of a loom comprises a first assembly which reciprocates about a vertical axis and a second assembly which rotates unidirectionally about another vertical axis, each of the assemblies having one of two coacting cutting elements which cut the yarns after presentation to the inserting element, while the first assembly also includes an arm which presents the yarns to the inserter and also positions them to be cut by the two cutting elements.

United States Patent 13,570,548

[72] Inventor Ramon Balaguer Golobart [50] Field of Search 139/ 1 22,Calle Valls y Taberner, l 1, Barcelona, 127, 302 Spain [2]] Appl. No.756,146 [56] References Cited [22] Filed Aug. 29, 1968 UNITED STATESPATENTS 1 t n g 32 3,276,482 10/1966 Liebchen 139/122w Pnomy 2; PrimaryExaminer-Henry S. Jaudon [31] 345,157 Att0rney-Christen & Sabol [54]DEVICE FOR PRESENTING AND CUTTING THE SELECTED WEFT THREADS INSTATIONARY WEFI LOOMS 6 Claims, 8 Drawing Figs. [52] US. Cl 139/122,139/302 [51] Int. Cl. 003d 47/36 -----i'iniiii ABSTRACT: Apparatus forpresenting weft yarns to the inserting element of a loom comprises afirst assembly which reciprocates about a vertical axis and a secondassembly which rotates unidirectionally about another vertical axis,each of the assemblies having one of two coacting cutting elements whichcut the yarns after presentation to the inserting element, while thefirst assembly also includes an arm which presents the yarns to theinserter and also positions them to be cut by the two cutting elements.

Patented March 16, 1971 3 Sheets-Sheet 1 Paten ed March 16, 1971 3Sheets-Sheet 5 The present invention refers to a device for presentingand cutting the filling yarns selected in looms with fixed weft reserve,and more particularly to a device in which the operations of presentingand cutting of the selected filling yarns are efi'ected simultaneouslyby said device.

There are several types of devices for presenting the filling yarns tothe inserting member in looms with fixed weft supply, which are basedgenerally on using hooks which pickup the yarns selected by a selectingdevice and presenting them,

through a vertical or horizontal turn, to the inserting member; theaddition of a separate device to cut the filling yarns is also required,and the two devices must be perfectly synchronized in the combination oftheir motions to effect these operations properly.

Similarly, there are various types of devices for the cutting of theweft yarns. The most usual ones comprise scissors, knives or othercutting elements, all of them actuated separately of the presentingelements, but still requiring a perfect synchronism between the cuttingdevices and the presenting elements. This causes mechanicalcomplications, and the risk of one element interferring with the other,unless the adjustment is perfect; they also require double controlmeans, which must also be synchronized with the inserting member, thusrequiring double adjustment.

The device which is the object of the present invention solves all ofthese disadvantages, since the device fulfills both functions ofpresenting the filling yarns selected to the inserting member and ofcutting the selected filling yarns at the edge of the fabric, withoutrunning the risk of the two mechanisms interfering with each other,since they operate under the same controls, thus eliminating completelyall adjusting and regulating operations, and carrying out the motions inperfect synchronization of positions in the whole operating cycle withrespect to the inserting member.

The device which is the object of the present invention comprises twoparallel support plates; an upper one and a lower one, which supportbetween them a mechanism actuated by a vertical shaft which is drivenrotationally by a suitable shaft of the loom. This vertical rotatingshaft crosses the lower support plate, and its free upper extremity,which crosses and is supported on the upper support plate, carries afirst gear wheel which transmits a rotating motion to a second gearwheel, and the latter to a third gear wheel afiixed on a second verticalshaft supported at its extremities on said support plates, upper andlower. The first vertical shaft which moves rotatively carries a cam,which slidably engages with a roller connected with a first element forthe presenting and cutting of the selected weft yarns, which ispresenting and cutting of the selected weft yarns, which is hingedrotatably in both support plates and comprises an. arm which presentssaid selected weft yarns to the inserting member, and a sharp appendagewhich serves as a cutting knife and forms a part of the cutting memberfor the selected weft yarns of the edge of the fabric, the unit beingimparted an arcuate oscillating motion because of the shape of said cam.

The second rotating vertical shaft, which carries the third gear wheel,also carries a second presenting-cutting element for the selected weftyarns, which is composed of an ann presenting the selected weft yarns-tothe cutting member at the border of the fabric of said yarns, and acutting knife, which forms a part of said cutting member; the whole unithaving an uninterrupted rotating motion in a clockwise direction.

For better understanding of the invention, one embodiment, given as anonlimiting example only, is described hereinafter, with reference tothe attached drawings.

FIGS. 1, 2 and 3 are perspective views of the first and secondpresenting-cutting elements listing various stages in an operation ofinserting and cutting of a weft thread.

FIG. 4 is a perspective view of one of the second presenting elementslisting details of its construction.

FlG. 5 is a side view of one set of presenting-cutting elements. FIG. 6is a perspective view of the device showing its relative position on thefeeding side of the loom.

FIG. 7 is a perspective view of a modification of the invention for thepresenting and cutting of the selected weft yarns on a loom with fixedweft supply which manufactures two parallel fabrics at the same time.

FIG. 8 is a detail view of the actuation of the spring of the presenting'arm and cutting knife of the second presentingcutting element.

In these FIGS. the unit as a whole is supported on a verticalhollowpedestal 38 affixed to the cross rail 41, of a loom by means of screws39 and 40. Within the pedestal there is rotatably mounted a verticalshaft 1, having a bevel pinion 42 at its lower end which meshes withbevel pinion 43 attached to the end of a rotating shaft 44 of the loom,as shown in FIG. 6. The upper end of the pedestal 38 supports a lowerhorizontal support plate 2 and an upper support plate 3 is mounted abovethe lower plate in, horizontal vertically spaced relationship. The upperof shaft 1 carries a first gear wheel 4, positioned between the twosupport plates, which meshes with a second gear wheel 5, carried on ashaft attached to plate 3 which, in turn, meshes with a third gear wheel6 affixed to a second vertical shaft 7 mounted between the supportplates 2 and 3.

A first presenting-cutting element 10, having two convergently directedhorizontally spaced appendages l2 and 13, is mounted on a vertical shaftll extending between the support plates 2 and 3. Appendage l2 terminatesin a flat nose-shaped portion 14 which is sharpened to form a cuttingknife and an L-shaped arm 17 is attached at one end by screws 15 and 16to the area of the element 10 between the bases of the appen dages 12and 13. A coil spring 20 surrounds shaft 11, one end of the spring beingsecured to the support platev 2 while the other end is attached to thepresenting-cutting element 10 to urge the element towards its initialand retracted position, this initialposition being determined by theextremity of the appendage' 13 which abuts against a fixed stop (notshown). Shaft 1 also carries a cam 8 having an eccentric peripheralsurface which engages with a follower, or roller, 9 attached to element10 so that rotation of the cam by shaft 1 will move the present-cuttingelement 10 from its initial position to the position shown in FIGS. 1-3against the force of coil spring 20- during a portion of each revolutionthereof, the spring returning the element 10 during the remainder of thecycle.

A second presenting-cutting element 21 is mounted on the lower end ofshaft 7 for continuous unidirectional rotation as a result of therotation of shaft 7 by shaft l through the meshing:

gears 4, 5 and 6. The mounting for element Zl includes a support 25affixed to the shaft 7 by means of a clamping screw 26. Support 25carries a horizontal fixed shaft 27, the extremities of this shaftprojecting outwardly of the support 25 to provide a fixed mounting for awinglike member 29 and a pivotal mounting for a second winglike member30. A presenting arm 22 is attached to wing 29, while a cutting element33 is placed on the extremity 32 of wing 39. The am 22 includes a curvedextremity 34 spaced from the cutting element 33 to provide a space forthe introduction of selected weft yarns 18. The support 25, as seen inH6. 8 has a projection 35 against which is applied one end of a coilspring '36, the other extremity of the spring abutting against adepending portion 37 of wing 30 to urge the cutting element 33 in anupward direction.

The operation is as follows:

The vertical shaft l to which is imparted a rotating motion transmittedby the bevel pinion 42 (FIG. 6), geared with the bevel pinion as appliedto a shaft 44 of a loom, transmits rotating motion to the first gearwheel 4 (FIG. 5), which, in

turn rotates the second gear wheel 5, the third gear wheel 6 and,finally, the second vertical shaft 7. Vertical shaft 1 also imparts arotating motion to cam. 8, which upon rotating in contact with roller 9,moves in an arc the whole assembly of the first presenting-cuttingelement H0 (H6. 2), composed of the presenting arm 17 and the sharpextremity 1.4 which serves as a cutting knife.

Simultaneously with this arcuate movement of the firstpresenting-cutting element which brings the presenting arm 17 andcutting knife 14 closer to the edge 23 of the fabric 24, the secondpresenting-cutting element 21 affixed to the second vertical shaft 7advances, so that arm 22 of said second presenting-cutting element 21moves beyond the position of presenting arm 17 of the firstpresenting-cutting element 10, said presenting arm 22 of the secondpresenting-cutting element 2! (FIG. 2) making the contact with theselected weft yarns 18. Upon continuation of its rotary advance, theforkshaped extremity of L-shaped arm 17 has positioned said selectedweft yarns 18 so as to move into the space between arm 22 and cuttingelement 33 (FIG. 1) in cutting position at the edge 23 of the fabric 24(FIG. 3), so that once they are placed in the position shown in FIG. 2by the presenting arm 17 of the first presenting-cutting element 10 andthe presenting arm 22 of the second presenting-cutting element 21, theyare picked up by said inserting member 31 and simultaneously the cuttingof these weft yarns 18 and 19 is effected through the contact of thecutting knife 33 of the second presentingcutting element 21 during itsrotary motion, with the sharpened extremity 14 of appendage 12 of thefirst presentingcutting element 10, the two knives 14 and 33 which formthe cutting member, acting as scissors. This results from theapplication of force by the coil spring 36 on the depending portion 37(FIG. 8) which produces an upward tilting of the cutting knife 33,causing a slight contact of the two knives 14 and 33 to effect thecutting.

Once the cutting is effected, the second presenting-cutting elementcontinues its uninterrupted rotation, guided by appendage 13 of thefirst presenting-cutting element 10, and simultaneously, said firstpresenting-cutting element 10 effects its return movement to its initialposition resulting from the configuration of cam 8 and the pressure ofcoil spring 20.

In the case in which a loom having fixed weft supplies has two parallelinserting members, the application of a device with a double set ofpresenting-cutting elements is extremely simple, in view of the smallvertical space required by the unit, as can be seen clearly in FIG. 7,which shows a modified form of device in which the arms 17 and 17' ofthe two first presenting-cutting elements 10 and 10' are in the positioncorresponding to the device shown in FIG. 1, as are all the othercomponent elements of the device.

Other changes and improvements may be made in the invention which wouldcome within the scope of the annexed claims.

Iclaim:

1. An apparatus for presenting and cutting yarns for a loom of the typehaving a fixed weft supply, a reciprocatory weft inserting device andincluding a rotary driven element, comprising first and secondpresenting-cutting means, means for mounting said two presenting-cuttingmeans on the frame of a loom for rotary movement about horizontallyspaced respective vertical axes, means for imparting oscillatory rotarymovement to the first presenting-cutting means in timed relationshipbetween said two rotary movements, said first presenting-cutting meansfor presenting yarn from a weft supply to an inserting means and alsoincluding a knife element, said second presenting-cutting meansincluding another knife element, and means for engaging said two knifeelements one with another during said rotary movement for severing ayarn.

2. Apparatus as defined in claim 1 wherein said apparatus includessupport means for mounting a pair of horizontally spaced shafts, meansfor drivingly connecting both said shafts with the rotary driven elementof a loom, said second presenting-cutting means being attached to one ofsaid pair of shafts, said first presenting-cutting means beingmounted onsaid support means, and camming means attached to one of said shafts forimparting said oscillatory movement to the first presenting-cuttingmeans.

3. Apparatus as defined -in claim 2 wherein said first presentin-cutting means includes a base rtion having a pair of space convergentappendages, one 0 said appendages including said knife element, theother of the appendages serving as a guide for the knife element of thesecond presentingcutting means, said base portion also carrying afollower element coacting with said camming means and a projecting armfor presenting weft yarns.

4. Apparatus as defined in claim 2, wherein said secondpresenting-cutting means includes a base portion mounted on one of saidshafts, and a member pivotally mounted on said base portion foroscillatory movement about a horizontal axis, said knife element andmeans for presenting weft yarns being attached to said oscillatorymounted member. 5. Apparatus as defined in claim 2, wherein said meansfor imparting oscillatory movement to the first presenting-cutting meansincludes cam follower means for abutting engagement with said cammingmeans, and coil spring means for urging said abutting engagement.

6. Apparatus as defined in claim 4, wherein said oscillatory mountedmember is provided with spring means for urging the knife element onsaid member into operative engagement with the knife element of thefirst presenting-cutting means.

1. An apparatus for presenting and cutting yarns for a loom of the typehaving a fixed weft supply, a reciprocatory weft inserting device andincluding a rotary driven element, comprising first and secondpresenting-cutting means, means for mounting said two presenting-cuttingmeans on the frame of a loom for rotary movement about horizontallyspaced respective vertical axes, means for imparting oscillatory rotarymovement to the first presenting-cutting means in timed relationshipbetween said two rotary movements, said first presenting-cutting meansfor presenting yarn from a weft supply to an inserting means and alsoincluding a knife element, said second presenting-cutting meansincluding another knife element, and means for engaging said two knifeelements one with another during said rotary movement for severing ayarn.
 2. Apparatus as defined in claim 1 wherein said apparatus includessupport means for mounting a pair of horizontally spaced shafts, meansfor drivingly connecting both said shafts with the rotary driven elementof a loom, said second presenting-cutting means being attached to one ofsaid pair of shafts, said first presenting-cutting means being mountedon said support means, and camming means attached to one of said shaftsfor imparting said oscillatory movement to the first presenting-cuttingmeans.
 3. Apparatus as defined in claim 2 wherein said firstpresenting-cutting means includes a base portion having a pair of spacedconvergent appendages, one of said appendages including said knifeelement, the other of the appendages serving as a guide for the knifeelement of the second presenting-cutting means, said base portion alsocarrying a follower element coacting with said camming means and aprojecting arm for presenting weft yarns.
 4. Apparatus as defined inclaim 2, wherein said second presenting-cutting means includes a baseportion mounted on one of said shafts, and a member pivotally mounted onsaid base portion for oscillatory movement about a horizontal axis, saidknife element and means for presenting weft yarns being attached to saidoscillatory mounted member.
 5. Apparatus as defined in claim 2, whereinsaid means for imparting oscillatory movement to the firstpresenting-cutting means includes cam follower means for abuttingengagement with said camming means, and coil spring means for urgingsaid abutting engagement.
 6. Apparatus as defined in claim 4, whereinsaid oscillatory mounted member is provided with spring means for urgingthe knife element on said member into operative engagement with theknife element of the first presenting-cutting means.